Routing Traffic Transport and Database Synchronization
The EIGRP routing protocol and autonomous system number is enabled by way of the global configuration command router eigrp autonomous-system-number. As mentioned, an AS is a logical grouping of routers that fall under a common administration. Here is the syntax for starting an EIGRP routing process on a router at the global configuration prompt:
RouterA(config)# router eigrp autonomous-system-number
The autonomous-system-number parameter is any number between 1 and 65,535 (16-bit). Make sure that you configure all the EIGRP routers in your network with the same AS number. Listing 7.5 will properly configure a serial interface on RouterBBR with an IP address of 10.1.1.1 and a 24-bit mask, ...
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